18475891812 has 144 divisors (see below), whose sum is σ = 55761189120. Its totient is φ = 5043354624.

The previous prime is 18475891769. The next prime is 18475891813. The reversal of 18475891812 is 21819857481.

18475891812 is a `hidden beast` number, since 1 + 8 + 47 + 589 + 1 + 8 + 12 = 666.

It is not an unprimeable number, because it can be changed into a prime (18475891813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7469808 + ... + 7472280.

It is an arithmetic number, because the mean of its divisors is an integer number (387230480).

Almost surely, 2^18475891812 is an apocalyptic number.

18475891812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18475891812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27880594560).

18475891812 is an abundant number, since it is smaller than the sum of its proper divisors (37285297308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18475891812 is a wasteful number, since it uses less digits than its factorization.

18475891812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802 (or 3797 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The spelling of 18475891812 in words is "eighteen billion, four hundred seventy-five million, eight hundred ninety-one thousand, eight hundred twelve".